Linux服务器硬件运行状态及故障邮件提醒的监控脚本分享

2020-07-27 19:02:48

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监控硬件运行状况

shell 监控cpu，memory，load average，记录到log，当负载压力时，发电邮通知管理员。
原理：
1.获取cpu，memory，load average的数值
2.判断数值是否超过自定义的范围，例如（CPU>90%，Memory<10%，load average>2）
3.如数值超过范围，发送电邮通知管理员。发送有时间间隔，每小时只会发送一次。
4.将数值写入log。
5.设置crontab 每30秒运行一次。

ServerMonitor.sh

#!/bin/bash  # 系统监控,记录cpu、memory、load average,当超过规定数值时发电邮通知管理员  # *** config start ***  # 当前目录路径 ROOT=$(cd "$(dirname "$0")"; pwd)  # 当前服务器名 HOST=$(hostname)  # log 文件路径 CPU_LOG="${ROOT}/logs/cpu.log" MEM_LOG="${ROOT}/logs/mem.log" LOAD_LOG="${ROOT}/logs/load.log"  # 通知电邮列表 NOTICE_EMAIL='admin@admin.com'  # cpu,memory,load average 记录上一次发送通知电邮时间 CPU_REMARK='/tmp/servermonitor_cpu.remark' MEM_REMARK='/tmp/servermonitor_mem.remark' LOAD_REMARK='/tmp/servermonitor_loadaverage.remark'  # 发通知电邮间隔时间 REMARK_EXPIRE=3600 NOW=$(date +%s)  # *** config end ***   # *** function start ***  # 获取CPU占用 function GetCpu() {   cpufree=$(vmstat 1 5 |sed -n '3,$p' |awk '{x = x + $15} END {print x/5}' |awk -F. '{print $1}')   cpuused=$((100 - $cpufree))   echo $cpuused    local remark   remark=$(GetRemark ${CPU_REMARK})    # 检查CPU占用是否超过90%   if [ "$remark" = "" ] && [ "$cpuused" -gt 90 ]; then     echo "Subject: ${HOST} CPU uses more than 90% $(date +%Y-%m-%d' '%H:%M:%S)" | sendmail ${NOTICE_EMAIL}     echo "$(date +%s)" > "$CPU_REMARK"   fi }  # 获取内存使用情况 function GetMem() {   mem=$(free -m | sed -n '3,3p')   used=$(echo $mem | awk -F ' ' '{print $3}')   free=$(echo $mem | awk -F ' ' '{print $4}')   total=$(($used + $free))   limit=$(($total/10))   echo "${total} ${used} ${free}"    local remark   remark=$(GetRemark ${MEM_REMARK})    # 检查内存占用是否超过90%   if [ "$remark" = "" ] && [ "$limit" -gt "$free" ]; then     echo "Subject: ${HOST} Memory uses more than 90% $(date +%Y-%m-%d' '%H:%M:%S)" | sendmail ${NOTICE_EMAIL}     echo "$(date +%s)" > "$MEM_REMARK"   fi }  # 获取load average function GetLoad() {   load=$(uptime | awk -F 'load average: ' '{print $2}')   m1=$(echo $load | awk -F ', ' '{print $1}')   m5=$(echo $load | awk -F ', ' '{print $2}')   m15=$(echo $load | awk -F ', ' '{print $3}')   echo "${m1} ${m5} ${m15}"    m1u=$(echo $m1 | awk -F '.' '{print $1}')    local remark   remark=$(GetRemark ${LOAD_REMARK})    # 检查是否负载是否有压力   if [ "$remark" = "" ] && [ "$m1u" -gt "2" ]; then     echo "Subject: ${HOST} Load Average more than 2 $(date +%Y-%m-%d' '%H:%M:%S)" | sendmail ${NOTICE_EMAIL}     echo "$(date +%s)" > "$LOAD_REMARK"   fi }  # 获取上一次发送电邮时间 function GetRemark() {   local remark    if [ -f "$1" ] && [ -s "$1" ]; then     remark=$(cat $1)      if [ $(( $NOW - $remark )) -gt "$REMARK_EXPIRE" ]; then       rm -f $1       remark=""     fi   else     remark=""   fi    echo $remark }   # *** function end ***  cpuinfo=$(GetCpu) meminfo=$(GetMem) loadinfo=$(GetLoad)  echo "cpu: ${cpuinfo}" >> "${CPU_LOG}" echo "mem: ${meminfo}" >> "${MEM_LOG}" echo "load: ${loadinfo}" >> "${LOAD_LOG}"  exit 0

监控网站是否异常
shell 监控网站是否异常的脚本，如有异常自动发电邮通知管理员。
流程：
1.检查网站返回的http_code是否等于200，如不是200视为异常。
2.检查网站的访问时间，超过MAXLOADTIME（10秒）视为异常。
3.发送通知电邮后，在/tmp/monitor_load.remark记录发送时间，在一小时内不重复发送，如一小时后则清空/tmp/monitor_load.remark。

#!/bin/bash  SITES=("http://web01.example.com" "http://web02.example.com") # 要监控的网站 NOTICE_EMAIL='me@example.com'                 # 管理员电邮 MAXLOADTIME=10                        # 访问超时时间设置 REMARKFILE='/tmp/monitor_load.remark'             # 记录时否发送过通知电邮，如发送过则一小时内不再发送 ISSEND=0                           # 是否有发送电邮 EXPIRE=3600                          # 每次发送电邮的间隔秒数 NOW=$(date +%s)  if [ -f "$REMARKFILE" ] && [ -s "$REMARKFILE" ]; then   REMARK=$(cat $REMARKFILE)      # 删除过期的电邮发送时间记录文件   if [ $(( $NOW - $REMARK )) -gt "$EXPIRE" ]; then     rm -f ${REMARKFILE}     REMARK=""   fi else   REMARK="" fi  # 循环判断每个site for site in ${SITES[*]}; do    printf "start to load ${site}/n"   site_load_time=$(curl -o /dev/null -s -w "time_connect: %{time_connect}/ntime_starttransfer: %{time_starttransfer}/ntime_total: %{time_total}" "${site}")   site_access=$(curl -o /dev/null -s -w %{http_code} "${site}")   time_total=${site_load_time##*:}    printf "$(date '+%Y-%m-%d %H:%M:%S')/n"   printf "site load time/n${site_load_time}/n"   printf "site access:${site_access}/n/n"    # not send   if [ "$REMARK" = "" ]; then     # check access     if [ "$time_total" = "0.000" ] || [ "$site_access" != "200" ]; then       echo "Subject: ${site} can access $(date +%Y-%m-%d' '%H:%M:%S)" | sendmail ${NOTICE_EMAIL}       ISSEND=1     else       # check load time       if [ "${time_total%%.*}" -ge ${MAXLOADTIME} ]; then         echo "Subject: ${site} load time total:${time_total} $(date +%Y-%m-%d' '%H:%M:%S)" | sendmail ${NOTICE_EMAIL}         ISSEND=1       fi     fi   fi  done  # 发送电邮后记录发送时间 if [ "$ISSEND" = "1" ]; then   echo "$(date +%s)" > $REMARKFILE fi  exit 0

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